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Question
Find roots of polynomial $$ p(x) = 7h+20 $$
Answer
The root of polynomial $ p(h) $ is:
$$ \begin{aligned}h &= -\dfrac{ 20 }{ 7 } \end{aligned} $$
Explanation
$$ \begin{aligned} 7h+20 & = 0 \\[1 em]
7 \cdot h & = -20 \\[1 em]
h & = - \frac{ 20 }{ 7 }
\end{aligned} $$
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